tyshell

   1 #!/usr/bin/python3
   2 import os
   3 import readline
   4 import shlex
   5 import sys
   6 import subprocess
   7 import socket
   8
   9 tuerSock = "/run/tuer.sock"
  10
  11 # use a histfile
  12 histfile = os.path.join(os.path.expanduser("~"), ".tyshellhist")
  13 try:
  14     readline.read_history_file(histfile)
  15 except IOError:
  16     pass
  17 import atexit
  18 atexit.register(readline.write_history_file, histfile)
  19 atexit.register(print, "Bye")
  20
  21 # available commands
  22 def helpcmd(c):
  23         print("Available commands: %s" % ", ".join(sorted(commands.keys())))
  24
  25 def extcmd(cmd):
  26         def run(c):
  27                 ret = subprocess.call(cmd)
  28                 if ret != 0:
  29                         print("Command returned non-zero exit statis %d" % ret)
  30         return run
  31
  32 def sendcmd(addr, cmd):
  33         def run(c):
  34                 print("Running %s..." % (cmd))
  35                 s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
  36                 s.connect(addr)
  37                 s.send(cmd.encode())
  38                 data = s.recv(4)
  39                 s.close()
  40                 print("...done")
  41                 if data != b'1':
  42                         print("Received unexpected answer %s" % str(data))
  43         return run
  44
  45 def exitcmd(c):
  46         sys.exit(0)
  47
  48 commands = {
  49         'exit': exitcmd,
  50         'help': helpcmd,
  51         'open': sendcmd(tuerSock, 'open'),
  52         'close': sendcmd(tuerSock, 'close'),
  53         'buzz': sendcmd(tuerSock, 'buzz'),
  54 }
  55
  56 # input loop
  57 print("Welcome to tyshell. Use help to see what you can do.")
  58 while True:
  59         try:
  60                 command = input("$ ")
  61         except EOFError:
  62                 print()
  63                 break
  64         command = shlex.split(command)
  65         if not len(command): continue
  66         # find suiting commands
  67         if command[0] in commands: # needed in case a complete command is a prefix of another one
  68                 cmdoptions = [command[0]]
  69         else:
  70                 cmdoptions = list(filter(lambda x: command[0].startswith(x), commands.keys()))
  71         if len(cmdoptions) == 0: # no commands fit prefix
  72                 print("Command %s not found. Use help." % command[0])
  73         elif len(cmdoptions) == 1: # exactly one command fits (prefix)
  74                 try:
  75                         commands[cmdoptions[0]](command)
  76                 except Exception as e:
  77                         print("Error while executing %s: %s" % (command[0], str(e)))
  78         else: # multiple commands fit the prefix
  79                 print("Ambiguous command prefix, please choose one of the following:")
  80                 print("\t", " ".join(cmdoptions))
  81                 # TODO: put current "command[0]" into the shell for the next command, but such that it is deletable with backspace
  82